Hello there Marym! Congratulations on coming so far. Here's my critique:

Starting with your organic forms, I have nothing to say really. Sometimes your forms stray a bit from their center lines (more of an issue of space I'm guessing) but it's really minor.

As for constructions, here are my observations:

• Some of your spheres or egg-shapes look a bit deformed which undermines their 3D quality - in this drawing for example. The ellipses for the head, thorax and abdomen look as if they're pinched on one point - neither circle nor oval. My advice is to practice ellipses some more. If the form you want to draw looks like an ellipse somewhat but is stretched from one side, I'd advise to start with an ellipse and build an additional form on top.

• In this drawing specifically, the the edges of the scales look like they aren't turning enough when they meet the silhouette, and that the silhouette itself isn't broken enough by each scale (I don't have your reference but looking at similar insects, the silhouette looks more pronounced).

• In some drawings (specifically the two last ones) you drew the antennae as circles snug in a line instead of a series of forms that wrap on top of one another and that have a precise silhouette, on top of a sausage form. No matter how small, you should draw everything as 3D forms that interact with each other.

• Some of your lines are repeated (outside of lines meant to convey line weight) and this is discouraged in general - if you miss the mark, just move on.

That's all you have to keep in mind. I think you're ready to jump into Lesson 5. Good luck!